1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 1996-2002 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/* LINTLIBRARY */
28
29#if !defined(_BOOT) && !defined(_KERNEL)
30#include <stdio.h>
31#include <ctype.h>
32#include <stdlib.h>
33#endif	/* _BOOT && _KERNEL */
34#include <sys/types.h>
35#include <sys/null.h>
36#include <sys/errno.h>
37
38#if	defined(_BOOT) || defined(_KERNEL)
39#define	isdigit(c)	((c) >= '0' && c <= '9')
40#define	isxdigit(c)	(isdigit(c) || (((c) >= 'a') && ((c) <= 'f')) || \
41			(((c) >= 'A') && ((c) <= 'F')))
42#endif	/* _BOOT || _KERNEL */
43
44/*
45 * Converts an octet string into an ASCII string. The string returned is
46 * NULL-terminated, and the length recorded in blen does *not* include the
47 * null terminator (in other words, octet_to_hexascii() returns the length a'la
48 * strlen()).
49 *
50 * Returns 0 for Success, errno otherwise.
51 */
52int
53octet_to_hexascii(const void *nump, uint_t nlen, char *bufp, uint_t *blen)
54{
55	int		i;
56	char		*bp;
57	const uchar_t	*np;
58	static char	ascii_conv[] = "0123456789ABCDEF";
59
60	if (nump == NULL || bufp == NULL || blen == NULL)
61		return (EINVAL);
62
63	if ((nlen * 2) >= *blen) {
64		*blen = 0;
65		return (E2BIG);
66	}
67	for (i = 0, bp = bufp, np = (const uchar_t *)nump; i < nlen; i++) {
68		*bp++ = ascii_conv[(np[i] >> 4) & 0x0f];
69		*bp++ = ascii_conv[np[i] & 0x0f];
70	}
71	*bp = '\0';
72	*blen = i * 2;
73	return (0);
74}
75
76/*
77 * Converts an ASCII string into an octet string.
78 *
79 * Returns 0 for success, errno otherwise.
80 */
81int
82hexascii_to_octet(const char *asp, uint_t alen, void *bufp, uint_t *blen)
83{
84	int		i, j, k;
85	const char	*tp;
86	uchar_t		*u_tp;
87
88	if (asp == NULL || bufp == NULL || blen == NULL)
89		return (EINVAL);
90
91	if (alen > (*blen * 2))
92		return (E2BIG);
93
94	k = ((alen % 2) == 0) ? alen / 2 : (alen / 2) + 1;
95	for (tp = asp, u_tp = (uchar_t *)bufp, i = 0; i < k; i++, u_tp++) {
96		/* one nibble at a time */
97		for (*u_tp = 0, j = 0; j < 2; j++, tp++) {
98			if (isdigit(*tp))
99				*u_tp |= *tp - '0';
100			else if (isxdigit(*tp))
101				*u_tp |= (*tp & ~0x20) + 10 - 'A';
102			else
103				return (EINVAL);
104			if ((j % 2) == 0)
105				*u_tp <<= 4;
106		}
107	}
108	*blen = k;
109	return (0);
110}
111